Loading device for dump trucks and the like



' 'June 9, 1953 R. L. PHERsoNy 2,641,370

LOADING DEVICE FOR DUMP TRUCKS AND THE LIKE '7 Sheets-Sheet ll Filed Aug. 11. 1948 N Vf' Af/ ATTORNEYS June 9, 1953 R. 1 PHERsoN 2,641,370

LOADING DEVICE FOR` DUMP TRUCKS AND THE LIKE Filed Aug. 11, 194s 7 sheets-sheet 2 ef-B -34 Fig. 2

IN V EN TOR.

` ATToRNEYs `lune 9, 1953 R. PHEsoN '2,641,370

LOADING DEVICE FOR DUMP TRUCKS THE LIKE Filed Aug. 11. 1948 7 SheetSfSheet 5 88j Fig.' 8

INVENTOR. @ew/MON!) l.. PHERSON ATTORNEYS `Bune 9, 1953 R. l.. PHERsoN 2,641,370

LOADING DEVICE FOR DUMP TRUCKS AND THE LIKE- F g 9 INVENTOR.

IEYMOND L. PHE R SON www ATTORNEYS .Fune 9, 1953 R. l.. PHERsoN LOADING DEVICE FOR DUMP TRUCKS AND THE LIKE Filed Aug. 11. 194e '7 Sheets-Sheet 5 .N MRW.; NE Y H MM WP. R L/m T WWA O mw mw June 9, 1953 i R. l.. PHERsoN LOADING DEVICE FOR DUMP TRUCKS AND THE-LIKE Filed Aug. 11, 1948 7 Sheets-Sheet 6 INVENTOR.

ATTORNEYS June 9, 1953 R. PHl-:RsoN 2,641,370

LOADING DEVICE FOR DUMP TRUCKS AND THE LIKE Filed Aug. ll, 1948 '7 Sl'lee'lZS-Slleel', '7

Fig. le '42 IN V EN TOR.

RAYMOND 1 PHERsoN BY www F ig. I7 ATTORNEYS Patented June 9, 1 *953 UNITED STATES PATENT OFFICE LOADING DEVICE FOR DUMP TRUCKS AND THE LIKE Raymond L. Pherson, Boulder, Colo.

Application August 11, 1948,` Serial No. 43,673

19 Claims. (C1. 21478) f This invention relates to loadingdevices, and more particularly to loading devices adapted to be removably installed on the rear of a dump truck or the like, for loading dirt, gravel, sand, ore or vother material into the truck body. Among the objects of this inventionare to provide a novel loader which may be attached to the rear end of a dump truck or the like; toprovide such a loader which may be driven by a power takeoff from the truck; .to provide such a loader which will pick up material disposed at the rear of the truck and deposit it in the body or box mounted on the truck; to provide such a loader which is readily attached to and detached from the truck; to provide such a loader which will pick up material at an extended distance to the rear of the truck, as well as closer to the truck, so that the position of the truck need be changed infrequently, if at all, before a substantiallyfull load is deposited on the truck; to provide such a loader which is adapted to dig down into, as well as to push or crowd in a generally horizontal di rection into a pile of dirt, sand, gravel, ore or other material to be loaded into the truck; to provide such a loader which may take one of several forms; to provide one form of such loader which is operated primarily by cables and pulleys, and another form which is operated hydraulically; to provide relatively simple Icontrols for such a loader, so that only one operator, such as a truck driver, is necessary; to provide such controls which arev operable from a convenient point, at which a Clear view of the loading operation is obtained; to provide such a loader which is suiciently sturdy in construction to withstand the rigors of hard usage and abuse; and to provide such a loader which is relatively easy to operate, requires a minimum of adjustment, and is highly satisfactory in service.

' Other objects and the novel features of this yinvention will become apparent from the description which follows, taken in connection with the accompanying drawings, in which:

Fig. 1 is a side elevation of a loader, comprising one embodiment of this invention, operated primarily by cables'and pulleys, installed on' the rear of a dump truck body, and showing a number of positions illustrative of loading operations;

Fig. 2 is a rear view of the loader and truck of Fig. l, with the loader in full upright position;

Fig. 3 is a side view of the loader, after detachment from a loaded truck, in position for standing until the same or another unloaded truck is moved into position for attachment of the loader thereto;

2 Fig. 4 is `a central vertical section of the loader, attached to the truck body;

Fig. 5 is a cable diagram for the bucket of the loader; Y

' Fig.'6 is a cable diagram for the boom of the loader;

Fig. 7 is an enlarged oblique section taken along lines l-l of Figs. 2 and 4, showing particularly the drive mechanism of the loader;

Fig. 8 is a vertical section taken along line 8`8 0f Fie. 7; Fig. 9 'is a fragmentary elevation, looking rearwardly along line 9+-9 of Fig. 7, showing a por--v tion of the drive mechanism;

Fig: l0 is a fragmentary transverse section, taken along line Ill-l0 of Fig. 9;

Fig. 11 is a side elevation, similar to Fig. 1, of a loader comprising another embodiment of this invention operated primarily hydraulically, in'v stalled on the rear end of a dump truck body, and showing a .number of positions illustrative of loading operations;

Fig. 12 is a rear View of the loader and truck of Fig. 1l, with the loader in a down position; .tgFig. 13 is a vertical section taken along line lsmprr'ig. 12; Fig. 14 is' a Vertical section taken along line I 4 I4V ofFg. 12;

Fig.' l5 is arienlarged horizontal section taken along line I5-|5 of Fig. 12;

16 is a front. elevation of the loader of Fig. 1'1, detached from the truck;

WFig. 17 is an hydraulicdiagram of the loader fFig. 11:1

= `Fig. 18 is a fragmentary vertical section, similar tov the upper left `portion of Fig. 13, illustrating a slightly different construction of certain parts f the loaderof Fig. 1l; and

- Fig. 19 is a fragmentary rear elevation of *thel construction ofFigf I8. l A truck loader constructed in accordance with thisV invention, andcomprising one embodimentA thereof, which is operated essentially by a system-of cables andpulleys, yis illustrated in Figs.

' 1 1'0. As in Fig. l, the loader is adapted to be mounted'pn the tail gatev l0 of the dump body D of a, truck, and to be operated to fill the dump loader is `also'adapted lto be readily detached from the truck, after having been placed in a standing position, as in Fig. 3. Such embodifmentof this invention, as inFig. 1, includes ya statiqnarynsupport orframe F, removably at-- tached to the tail gate l0; a pivotal support of boom S, pivoted at its lower end on the frame F and adapted to be moved to a desired position by a cable II, or by gravity; and a bucket or scoop B pivoted at its upper end on boom S and moved to desired positions by a cable I2, or by gravity. The bucket B may include a curved scoop plate I3 which, as in Figs. l, 2 and 4, is desirably provided with digging teeth I4 along the front edge, the front end of the scoop plate I3 preferably being straight, the central portion being arcuate and the rear end preferably having a slight reverse curvature, so that material will tend to slide forwardly into the dumpbody D when the bucket B is in the upright position f of Fig. 2 or in the dotted position B-3 of Fig; l above the dump body D. The SCOOD plate I3: is mounted at the lower end of and between a pair of parallel arms or plates I5, the lower ends of which form side walls for the bucket.

The boom S is movable from the upper yverticall or full position of Fig. l, to a lower dotted position S-I, to an even lower position, or to intermediate positions. The bucket B is movable about its pivot point, generally through an arc for each position of the boom S, it being understood that the boom and bucket may be .moved simultaneously, to produce an approximately straight. line or otherv desired motion. Thus, when the boom S is in the solid position of Fig. 1, the bucket B may be moved to various positions along dotted arc I6, such as being dropped to a, lower dotted position B-I from full position B, moved upwardly to rear dotted position B-2, or over to front dotted position B-3, for unloading. When the boom S is in the dotdash position S-I, the bucket B may be moved to various positions along dot-dash arc I1, such as to a lower dot-dash position B-4 or an upper dot-dash position B-5. The movement of the bucket required is only that necessary to load material into the bucket. As will be evident, the bucket may be extended a considerable distance to the rear of the truck, particularly when the boom is in a lower position, and may also be used in digging down beneath the level of the ground on which the truck is standing. As will be evident, the bucket may crowd` into the material to be loaded, as by simultaneously lowering the boom S and pivoting the bucket B thereon, as for example to move the -bucket from position B or B-I to position B-d. Such crowding may be produced at substantially any level, as rearwardly from position B-.

While it is sometimes necessary to push the` bucket into the pile of material more than once, as soonl as the bucket is full, it is raised to an upper position, such as B-5, whereupon the boom may be pulled up to the full position, and the bucket then swung about the upper portion of arc I6, to cause the material to be deposited in the truck body. By stopping the bucket in an almost upright position, such as that, shown in,

Fig. 2, the material will fall into the rear end oi thetruck body; or by moving the bucket up and over with greater speed, the material may be thrown clear to the cab. Normally, the bucket, when moved over onto the dump body D at a normal speed, will deposit the material` in about the center of the dump body.

" After the truck has been loaded, the bucket may be movedover on top of the pile of material.-- in` the dump body, and the loader carried with the truck. Or, if the driver is coming back for another load at the same spot, or the haul isrelatively long,the loader may be detache'dfromv the truck very quickly, merely by letting the end of the bucket come to rest on the ground, as in the position of Fig. 3, and taking the weight of the loader off the tail gate by extending hydraulic jacks J. Then, a locking pin I8 (see also Fig. 2) is pulled, a drive shaft coupling I9 disconnected, and frame F elevated by hydraulic jacks J, after which the truck may be driven away from the loader. When there is a full load in the dump body D, the frame F is preferably jacked up a suicient distance, such as ve 01' six inches, so that when the truck returns, the elevation of the frame F will correspond to the elevation of the tail gate I0, as indicated by the dotted position thereof of Fig. 3. This difference in elevation is due to the weight of the load in the truck which depresses the springs,

' the truck body thereby assuming a higher position when empty than when loaded.

If desired, the loader may remain on the truck, and the load dumped by elevating the forward end 0f thev dump body by the conventional equipment. However, since the attachment and removal of the loading device of this invention to the truck body is relatively simple and may require only a few seconds of time, it is normally simpler merelyto remove the loading device prior to dumping the load. The cable and pulley systems for operating the bucket B and boom S are illustrated diagrammatically in Figs. 5 and 6, respectively. As Ain Fig. 5, the cable I2 for the bucket B is wound at one end around a drum 2U, mounted for rotation on a shaft 2 I, the opposite end of the cable fbeing attached to a xed rod or shaft 22, on which bucket arms I5 are pivoted. From the drum 2Q, he cable I2 passes over a guide pulley 23, mounted on a shaft 24 which is carried by boom S, and then around a sheave 25 which is mounted on the bucket B. Thence, lcable I2 passes around a central pivoting sheave 2E, back to a second sheave 2'! mounted on the bucket, and thence arounda guide pulley 28 to its point of attachment to fixed rod 22. As will be evident from Figs. 2, 4 and 5, when the cable I2 is wound on the drum 20, the bucket B will be pulled toward the boom S, since the shaft 24 for guide pulleys 23 and 23 is mounted at the upper end` of the boom S, extending between a pair of arms or plates 29 each having an enlarged upper end orrhead 30 to accommodate shaft 24 and a second shaft 2,4', parallel thereto, on which is mounted alternative guide pulleys 23' and 28. As will be evident from Fig. l, when 'the bucket B is in a pivotalposition to the rear of the Iboom S, the

f bucket cable I2 will pass over'the guide pulleys 23 andv 28, but when the bucket is in a position forward ofy the boom S, such as position B-3 of Fig. 1, the bucket cable I2 will pass over guide pulleys 23 and 2u. Also, when the bucket B is moved from a rear position to a forward position,

such as through the upright yposition of Fig. 2, the bucket cable I2 will at that time be passing from guide pulleys 23 and 28 to guide pulleys 23' and 28.

As the bucket B passes. through this upper position, the central pivoting sheave 2li will also be shifting in position, as indicated more clearly in Fig. 4. The central pivoting sheave 26 is not only mounted for rotation about its own shaft, as cable I2 passes thereover, but also for pivotal movement about a horizontal axis, and for movement between rear and front positions, about shaft 22 as an axis. Thus,v sheave 26 is pivotally mounted between awpair of arms or plates ,3I`, .4

in turn pivotally mounted at their lower .ends on xed rod or shaft 22,' each plate 3| being provided at its upper end with a rearwardly extending nose 32, which provides additional clearance for cable I2 over shaft 24, when bucket B is in the lower, rear position. As bucket B is pulled upwardly, as from the full position of Fig. 4, sheave 26 will `turn until it reaches the vertical position of Fig. 2, when the cable I2 passing through pivoting sheave 26 is directly in alignment with fixed rod or shaft 22. As the bucket swings through dead center, at the top of its arc of movement, sheave 26 will swing with it, since the arms 3I for pivoting pulley 26 will swing from the full to the dotted position of Fig. 4, the extent of the movement of the arms 3I being determined by abutment of the same against the shafts 24 and 24', respectively. By releasing the -cable I2, as by releasing a brake for drum (in la manner described later), the bucket will begin to move forwardly and downwardly by its own Weight toward the dump body D, such as to ,the dotted position of Fig. 4. After the bucket has dumped its load into the dump body of the truck, drum 20 may be again rotated to cause cable I2 to be drawn onto Athe drum, thereby pulling the bucket back up to the center position, at which time the bucket will tend to swing back across dead center, the pivoting pulley 26 and its supporting arms 3| moving from the dotted to the full position of Fig. 4 at the saine time, so that when the lpivoting pulley has swung back to the full position, the bucket will have moved past dead center and can then be lowered by releasing the brake drum 20. As will be evident, the pivotal movement of the supporting arms 3l from the full to the dotted position of Fig. 4, and vice versa, is of considerable advantage, in that the bucket does not tend to stay in a dead center position, since as soon as it starts to move past dead center in either direction, the arms 3I will immediately swing over, and the bucket will move past dead center to the opposite position. By such construction, the possibility of the bucket becoming stuck on dead center is substantially eliminated.

The guide pulleys 28 and 28', being adjacent the point of attachment lof the end of vthe bucket cable I2l to rod22, ordinarily do not rotate, and may be replaced by fixed quadrants or the like having cable receiving flanges, but it is simpler merely to install a pair of pulleys on the shafts 24 and 24. The sheaves 25, 26 and 21 are provided with conventional housings as shown, and suitable brackets 33 are attached to thetop of the scoop plate I3, as in Figs. 2 and 4, for attachment of the sheaves and 21. The arms I5 for the bucket B may further be provided with suitable reinforcing bars or strips 34, as in Figs. 2 and 3.

' The pulley and cable drive arrangement for the boom S is illustrated diagrammatically in Fig. 6, and includes a drum 35, also rotatable on shaft.2I, on which cable II is adapted to be wound, the opposite end of cable I I being secured to a stationary clip or stanchion 36, on framework F. From drum 35, cable II passes up over a pulley 31, mounted on shaft 22, which, as indicated previously, is mounted-between the arms 29 of boom S; thence forwardly over a pulley 38 on a stationary shaft 39, which in turn is mounted in frame F; thence rearwardly around a second pulley 40 on shaft 22; thence around a second` pulley 4I on shaft 39; thence around a third pulley -42 on lshaft 22; and nally `forwardly to stanchion 36. As will be evident from Fig.1 6, when cable II is wound on drum 35, the shaft 22 of the boom S will be moved closer to the stationary shaft 39 on frame F, thereby raising the boom. Conversely, when the cable Il is permitted to unwind from drum 35, the shaft `22 will move away from shaft 39, therebypermitting the boom S to be lowered Iby gravity.

The xed support or frame Fmay include a pair of side plates 44, as in Fig. 2, spaced farther apart at their lower ends to accommodate drivev mechanism mounted on a platform' 45, which extends across between the lower ends of side plates 44, while the lesser width at the top provides more stable support for pulleys 38 and 4I. Toward their upper ends, the side plates 44 converge, as in Fig. 2, and terminate in heads 46, between which extends stationary shaft 39. Heads 46, as in Fig. 4, overhang the tail gate I0 of the dump body D, and are also provided with lips 41 adapted to catch onto the inside of the tail gate. The side plates 44 may be connected together by reinforcing rods 48 and 49, as in Figs. 2 and 4, extending between the plates and adapted to provide a more rigid structure, reinforcing rod 48 preferably being above and reinforcing rod 49 preferably being below locking pin or rod I8, by which the framework is more securely attached to the tail gate. As in Fig. 2, a pair of angles or clips 50 may be welded or suitably attached to the tail gate I0 and the outwardly extending flanges thereof provided with suitable holes through which the locking pin I8 extends. As will be-evident from Fig. 4, with the locking pin I8 in positionthe framework F is held securely to the tail gate IIJ,- since the lips 41 cannot come off the top of the tail gate.

One of the jacks J is mounted on each of the side plates 44 of frame F, each jack normally including a b-arrel 52, preferably mounted vin vertical position on the side plate 44. Each jack also includes a piston or plunger 53, provided with a footing 54 and adapted to be extended downwardly from the barrel 52; a pump 55 for producing hydraulic pressure; and a handle 56 for operating the pump 55. In addition, each jack includesa conventional release valve (not shown) for releasing the pressure of fluid against the plunger 53 when the jack is to be released. Suitable means for locking the plunger in an `,upper position, such as a locking pin (not shown), may also be provided.

In attaching and disconnecting the loading device from the truck, only two connections are necessary. One connection is the locking pin or rod I8, which may readily be inserted in or pulled from the holes in side plates 44 and angles 50. The other connection is the collar yor coupling I9 which, as in Figs. 3 and '1, may be internally square, so as to t onto the square end of an input shaft 51 of a speed reducer 58 and also onto the square end of a power shaft 59. The latter may be provided with one or more universal joints 60, and extends from a conventional power takeoff` at the truck transmission (not shown), rearwardly'along the frame 6I of the truck, as in Fig. 3. The coupling I9 may be provided with one or more holes, and the shafts 51 and 59 with corresponding holes, so thata cotter pin 62 or the like, for locking the coupling against longitudinal movement on the shafts, may be inserted when connecting the loading device to the truck, and removed when the device is disconnected. The same pin may -be'used in attaching the coupling |9 to the shaft 51, to prevent loss when the device is disconnected 'from the truck. The drive mechanism for operating the cable and pulley systems for the boom and bucket, respectively, is mounted on the platform d5, and includes, as in Fig. 7, the speed reducer 58 which is adapted to rotate the slow speed drive shaft 2| which, for the sake of rigidity, may extend through the side plates 4d of frame F, bearings 65 for shaft 2| being attached to the side plates. Also, they slow speed shaft 2| may extend outwardly to each side of the plates 44, and the arms 29 of boom S pivot'ally mounted on the overhanging ends, as by collars 63. Thedrum 20 for cable I2 and the drum 35 for cable are each mounted for free rotation on the shaft 2|, each drum conveniently being made by welding a pair of circular plates to a hub to provide a single groove drum on which the cable is wrapped in successive layers. While a single groove drum conserves lateral space, other types of drums may be utilized. A cylindrical brake and clutch flange 6l may be also Welded to one side of each of the drums 2c and 35, respectively, the clutches being operated by cones 68 splined on shaft 2|, and the brakes respectively including bands 69 and 69', preferably lined on the inside with suitable friction material.

The drive mechanism is controlled by operating levers and the handles of which are disposed at one side-of the loading device, as in Fig. 2, at the rear of the dump body D, thereby giving the operator an unimpeded view of the operation of the bucket B in digging into and scooping up the material to be loaded. In the example shown, the ope-rating levers 'in and 1| are so constructed and connected to the clutch and brake mechanisms, that lever 'iii may be moved in one direction to first cause the brake for bucket drum 2E! to disengage and upon fur ther movement to cause the clutch therefor to disengage; and moved in the opposite direction to first cause the brake for boom drum 35 to disengage and upon further movement to cause the clutch therefor lto engage. In neutral position, of course, neither clutch is engaged and both brake bands are normally automatically maintained tight. Thus, by moving lever le in one direction, the brake for the bucket, for instance, may be released and the bucket permitted to drop, either rearwardly or forwardly, depending on the position of the bucket prior to brake release. When the lever 'it is moved farther in the same direction, the clutch for drum 2U will be engaged, and the cable l2 wound upon drum 20, whereupon the bucket B will be lifted. Similarly, movement ofthe lever 'i0 in the opposite direction will first cause the brake for drum 35 to be released, whereupon the boom S may be lowered by gravity to a desired position. (It may sometimes be desirable to lift the bucket slightly to provide a suflicient weight on the boom to cause it to be lowered by gravity.) When the lever lil is moved farther in this direction, the clutch for drum 35 will be engaged. and the boom will be raised` It may sometimes be desired to simultaneously lower the boom and also either lower or raise the bucket, as when crowding into a pile of material, as by movement of the bucket from position B-I of Fig. 1 to position B-i. For this purpose, lever 7| is connected with the brake for boom drumt, so that the brake may be released Y engages a pin 82 on rod 80.

by lever 1| while lever IU is being used to control the bucket, It will be understood, of course, that one lever may control the bucket and the other the boom, and that other lever arrangements may be utilized.

While various operating connections and various types of clutches and brakes may be utilized, one form found suitable for use is illustrated in Figs. 7 to 10, inclusive. As in Fig. 8,'each clutch may include a pair of expanding blocks 12, lined on the outside with suitable friction material and pivotally mounted at their lower ends on pins 13 extending from a back plate 14, which rotates continuously with shaft 2|, being attached thereto by a key or the like. The upper ends of the blocks l2 are connected by a toggle joint 15, comprising a pair of pivoted links provided with a lug 16. As in Fig. 10, the corresponding cone 68, splined on shaft 2| and therefore rotating at the saine speed the back plate 14, is provided with a finger 'Vl having a roller it at its outer end. When this cone |58 is moved toward the back plate 14, the roller 18 will move lug 'i6 outwardly, thus causing the blocks 'l2 to pivot outwardly and engage the flange, thereby rotating the corresponding drum. The clutch cones 68 are moved on shaft 2| by means of a fork "i9, which is movable by lever lil, as in Fig. 9, through a rod 80, which is movable longitudinally by lever 'i0 through a slotted link 8|, which pivots with lever 'l0 and Rod 8|] is provided with a cam section 83 for releasing brake band 69, in a manner described below, and its offset end is threaded for attachment to the lower end of fork 19. The offset end of a second rod 84, having a cam section B3 for releasing brake band 69 in a manner also described below, is threaded into the fork i9 from the opposite side, rods 80 and 84 being adjustable and maintained in adjusted position by lock nuts 85, or in any other suitable manner. Each cam section 83 and S3 extends through a fork 86, which, as in Figs. 8 and 9, is connected by an adjusting bolt 8'! to the free end of the corresponding brake band, so as to tighten the band on the drum. Each fork B5 is provided with a roller or follower 8%, which follows along the underside of cam section 83 or 83', to release the brake, or engages the underside of rod or 8f3, to the left or right of the respective cam section, to maintain the brake bands 59 and B9 tight. Suitable bearings S9, for rods 80 and 84. are mounted on platform 135.

When the lever l0 is moved upwardly, to cause the rod 80 to move to the right in Fig. 9, for instance, the cam section 83 will permit the follower 88 and corresponding fork `895 for the brake band |39 of drum 2t to move upwardly, thereby releasing the brake. 'When the lever l0 is moved farther upwardly, to cause the rod 86 to move farther to the right, the clutch for drum 20 will engage. As will be evident, during this time the follower 88 for the brake band l69 of drum `3.5 will be held by the underside of rod 84, to the left of cam section v83', so that'the brake for drum 35 will remain tight. Similarly, when the lever l0 is moved downwardly to move the rod 84 to the left, the brake band 69' for drum 35 will first be released by cam section 83', and upon further movement the clutch for drum 35 will engage. At the same time, the follower 8B for the brake ban-d 59 of drum 2Q will remain in engagement with the lunderside of rod 80, to the right of cam section 83, thereby causing the brake for drum 2B to continue tight.

The brake band 69 for drum 35 is similar to the brake band 69 for .drum 20, except that, as in Fig. 8, instead of its dead or normally fixed end being anchored to platform 45,`it is movable by lever 1|, so that the brake band 69' may be released by movement of lever 1|. This may be accomplished by pivoted lever 1| on a post 90 and attachment of the end of lever 1| to one corner of a triangular plate 9|, pivotally mounted at another corner on platform 45, and attachment of the third corner of plate 9| to the normally fixed end of brake drum 69'. As will be evident, by movement of lever 1|, the position of the normally xed end of brake band 69' may be shifted, so that the brake is released.

It will be understood, of course, that other types of clutches, such as a disc clutch or screwoperated cone clutch, other types of braking mechanism, and variations in the manner in which the levers 10 and 'il are connected to and operate the clutches and brakes, may be utilized. Also, as indicated previously, one lever may voperate the clutch and brake for drum and the other lever operate the clutch and brake for drum 35.A However, it is normally easier to use merely one lever to operate the bucket and boom alternatively, since little time is usually lost by operation of the second lever.

The hydraulically operated embodiment of this invention, illustrated in Figs. 11-19, inclusive, includes a stationary support or frame F', attached to tail gate I0 of the dump body D; a movable support S', pivotal about a stationary shaft 94, mounted on frame F'; and a bucket B', movable longitudinally with respect to support Si and also pivotally movable with resp-ect thereto. As illustrated in Fig. 11, the bucket B' is adapted to be moved relatively to a pivoted or movable support S', so as to "crowd or push laterally into a pile of material, as in movement from the full position to the dotted position B'| of the bucket. At the same time, of course, the movable support S', which is preferably pivoted at its upper rather than at its lower end, may be swung outwardly to the corresponding position S'-|. The movable support S' and bucket B' may also, of course, be moved to a variety of different positions, useful particularly in filling the bucket B' withthe material to be loaded into the dump body D. As soon as the bucket is full, the movable vsupport S' may be swung to an upper rear position S-2, with the bucket in a corresponding position B-2, shown in dot-dash lines .in Fig. 11. The movable support S' may then be swung forwardly to a forward upper position SJ-3, and the bucket moved slightly relatively thereto to the position B'3, shown in dotted lines in Fig. 411, so

that the material in the bucket will be Idepositedin the dump body D. As vwill be evident, vthe material may be dropped gently into the rear end of the dump body, or depending upon the speed at which the movable support S' is moved around through the top of its arc, and also the relative .position of the bucket with respect thereto, the` through suitable holes in the side plates 95, and

also through holes in angles or brackets 50',

Thus, as in which may be welded or .otherwise suitably attached to the tail gate. I0. Side plates 95 are preferably generally triangular, shaft94 extending between the rear points thereof with the splined ends 96 thereof fitting into corresponding apertures in plates 95, so as to space the shaft 94 a suiiicient distance rearwardly of the tail gate l0, to accommodate the movable support S'. A mounting plate or bracket 91 isr attached between the lower ends of the side plates 95, a pump 98 for producing hydraulic pressure for operation of the loading device being mounted thereon adjacent one of the side plates 95, and a hydraulic valve control unit 99 being mounted on the overhanging end of plate 91, as in Fig. .12'. The pump is provided with an input or drive shaft 51', as in Fig. 6, which is adapted to be provided with a collar or coupling I9', as in Fig.- 14, in turn adapted to be connected to and disconnected from a power shaft 59', in a manner similar to the nrst embodiment. The loading device ofthe second embodiment may also be attached to and disconnected from the tail gate 0 -in somewhatthe same manner as` the rst embodiment, although, as in Fig. 16, the bucket B' thereof may be extended to set directly.` on the ground and the movable support S and frame F' thereof elevated slightly by hydraulic, pressure. Thus, by locking certain hydraulicv pistons of this loading device in a desired posi- A tion', in a manner explained later, the device may be set in upright position on the ground.

The bucket B', as in Figs. l2 and 1.3,.may comprise a scoop .plate |00 having digging teeth I4'. mounted on thel forward edge thereof, the frontl end of the scoop plate being substantially straight,y and the center and rear being curved, as in Fig. 13, so that, by rearward thrust ofthe bucket,

material will be loaded thereinto, and can then.

be carried up and over and deposited into the* dump body D. The ends of the scoop plate |00 may be closed by side plates'll, each having an' edge configuration corresponding to the curvature of the scoop plate and attached thereto in a suitable manner, as by welding. The bucket B' is pivotally mounted, by two sets of brackets |02, attached to the` rear underside of the scoop plate |00 and pivoted-'on pins |03, in turn mounted on the lower end of each of a pair of piston rods |04. lOnepiston rod |04 is disposed at each side of the movable support KSi', and extends from the.y lower end of a double-ended cylinder |05. Move-A. ment ofthe bucket longitudinally withV respect to.Y the movable support S' is produced by the piston.' rods |04,.while-pivotal movement of the bucket'. about pins |03 is obtained through a piston'rodl |06, which extends from a hydraulic cylinderA |01, as in Fig. 14. The movablesupport S' is moved to its different 'positions by the reaction between a pair of,-

racks |09 and cooperatingxed gears H0, held ||3, `,in turn mounted in xed position on, the

splined ends 96. of stationary shaft 94, asY in' Fig. 15.

As in Fig.,13, each rack |09 is-attached at upper end to a piston rod ||l|, moved inwardly its f or outwardly in an upper chamber 5 of doubleended cylinder |05 by pressure exerted against one side or the other of a piston IIB. When hydraulic pressure is exerted against the lower end of piston IIS, i. e. between piston ||6 and partition III in cylinder |05, as in Fig. 13, the piston rod II4 will be forced out of the `upper end of cylinder |05, and each rack |09 Vwill tend to move upwardly with respectI to the cylinder I 05. However, rack |09 cannot turn fixed gear |I0, so the only direction in which the rack can move, with respect to the gear, is around the gear. Thus, when piston rods II4 are moved upwardly, the reaction between the racks |09 and xed gears causes the support S to pivot around. stationary shaft 94, as indicated by the arrows of Fig. 13 and as will be evident from the various positions of support S' shown in Fig. 1l. Similarly, when hydraulic pressure is exerted against the upper end of piston IIE, the support S will be forced to pivot in the opposite direction, i. e. reversely to the arrows of Fig. 13.

The support S', as in Figs. 13 and 15, may

also be provided with guide blocks or .slides I I8,

mounted longitudinally in the wedge shaped spaces between cylinder |05 and the side plates I I|, and .adapted to maintain the racks |09 in alignment. A slide I9, as in Figs. 13 and 16, may be provided for each lower piston rod I 04, being formed integrally therewith or attached thereto, while a guide plate for each slide |I9 is mounted between the side plates |II, and guides I2|, similar to guides IIB, are provided therefor in the opposite wedge shaped corners between cylinder |05 and the side plates I.I.|. In addition, as in Figs. 13, 15 and 16, a roller |22, mounted on a shaft |23 may extend between the lower ends of side plates II|, the rollers |22 being adapted to take the shock load imposed upon slide ||9, wear thereon being compensated by adjustment of the position of shaft |23 through adjusting screws |24.

A chamber I 25 is formed inthe lower end of cylinder |05 beneath partition IIT, in which is disposed a piston |26, for moving the piston rod |04 to move the bucket B longitudinally with respect to movable support S. Cylinder |01 provides a chamber |28 in which hydraulic pressure is exerted against one side or the other of a piston |29, to move piston rod Illial and cause the bucket B' to pivot about pins |03.. Piston rod |||t` is pivotally attached at its lower end to a bracket |30, which is welded or otherwise suitably secured to the rear side of scoop plate |00, L

the latter being provided with a box or recessed section I 3| to permit the lower end of -rod |06 to be pivoted at a point offset from the pins |03 and the path of movement of pistonrods |04. In addition, the upper end of cylinder l|01 may be oiiset lfrom stationary shaft 94, as by being attached adjacent the front corner of a triangular plate |33, in turn attached to and extending laterally from a tube or collar |34, which is adapted to rotate about shaft 94, a rear gusset or plate and side gussets |36 preferably being provided for reinforcing purposes. By offsetting the upper end of cylinder |01 with respect to stationary `shaft 94, cylinder |01 more readily clears the top of tail gate I 0 when the bucket is moved over onto the dump body D, and permits the bucket to be laid down flat, in horizontal position, on the dump body.

Control of the movement and position of the various pistons in the hydraulic cylinders of this l2 embodiment may be eifected in any suitable manner, the system illustrated diagrammatically in Fig. 1'7 being understood to be only one of several which may be utilized. The hydraulic valve control unit 99 `is supplied with fluid under pressure by a conventional hose or pipe connection from pump 90, and a conventional drain connection leads back `to the usual iiuid reservoir, as in the pump housing. The control unit may be provided with three handles |38, |39 and |40, respectively, each of which, when moved to one position, is adapted to connect the pump pressure line with one of two cylinder lines, and the other cylinder line with the reservoir drain. When moved to the opposite position, the handle causes the opposite cylinder lines to be connected with the pressure and drain lines, respectively. The valves for effecting such control may be conventional, and therefore are not shown, but may be installed within the unit 99. In the neutral position, neither the pressure nor the drain line is connected with either cylinder line, so that thc piston under control remains in its position whenever the handle is moved to neutral. Each cylinder line may be partly a pipe and partly a flexible hose, or entirely a flexible hose. The lines -controlled by handle |38 include a cylinder line I4I, having a branch leading to each of the upper chambers |I5 in double-ended cylinders |05, but above the piston IIG, and another cylinder line |42, controlled by handle |38, having a branch leading to each of the chambers |15, but below the pistons IIB. As will be evident, the .handle |38 controls the pivotal movement of the movable support S. since when thrown in one direction .it will cause hydraulic fluid under pressure to be supplied through cylinder line |4| to chamber |I5 above piston Ii, thereby causing support S to pivot or rotate in a counter-clockwise direction, as viewed in Figs. l1 and 13, i. e. to return to a lower position. When the handle |38 is thrown in the opposite direction, hydraulic fluid under pressure is supplied through cylinder line |42 to chamber I|5 below piston IIB, thereby causing the piston rod |I-4 to move outwardly, and each rack |09, through engagement with the fixed gear H9 to force the movable support S to pivot in a clockwise direction about stationary shaft 94, as viewed .in Figs, 11 and 13. The handle |39 is a bucket longitudinal positioning handle, being adapted to control the flow of hydraulic iluid through a cylinder line |03, having branches leading to the chambers |25 but above pistons |25, and a cylinder line |44, having branches leading to each of the chambers |25, but below pistons |25. As will again be evident, movement of handle |39 in one direction causes hydraulic fluid under pressure to be supplied through cylinder line |43 to cause piston rod |04 to be extended from cylinder |05, thereby moving the pivot pins |03 and bucket B' longitudinally, and away from the normally lower end of pivoted support S. Similarly, movement of handle |39 to an opposite position causes fluid under pressure to be supplied through cylinder line |44 to cause piston rod |04 to be retracted. Handle |38 is a bucket pivot control handle, and the two cylinder lines controlled thereby are a cylinder line |45 leading to chamber |28 in cylinder |01, but above piston |29, and a cylinder line |06 Vleading: to chamber |28 but below piston |29. As will again be evident, movement of handle H10 in one direction will cause hydraulic fluid under pressure to be supplied through cylinder line |45 to Acause the bucket B' to pivot about pins |03, outwardly and away from the movable support S', such as from the full'position of Fig. 11 to the dotted position B-|. Similarly, movement of handle |40 in the opposite direction causes hydraulic fluid under pressure to be supplied through cylinder line |45 to cause the piston rod |06 to be retracted and the bucket B to pivot toward the movable support S', as from the position B'-2 to the position B-3 of Fig. l1. It will be understood, of course, that whenever hydraulic fluid under pressure is supplied to one end of one of the chambers, the fluid in the opposite end of the chamber is simultaneously removed through the drain line, back to the pump reservoir.v

The cylinder lines 4| to |46, inclusive, are conveniently led to the respective cylinders from aposition along mounting plate 9'5 to one of the side plates 95 of frame F', thence up to the top of the side plates 95, as in Fig. l2, to a point adjacent stationary shaft 94. The branches of cylinder lines |4| to |44, inclusive, may conveniently pass upwardly along the outside of side plates 95, and the cylinder lines |45 and |45 may conveniently pass upwardly along the inside of these plates, as in Figs. 14 and 16. From there, the cylinder lines may pass down along thevmovable supports S', or over to the cylinder |01, respectively. Since the supports S', as well as the cylinder |01, each pivot about the stationary shaft 94, a small loop in each of the lines will provide suflcient exibility for the pivotal movement of the supports S and cylinder |01. lines |45 and |46 maybe attached to plate 95 atA a point adjacent shaft 94, and then across to the top of triangular plate |33, a loop |41 thereby being formed in each line. Fromplate |33, line |45 is connected to the upper end lof cylinder |01, as in Fig. 14, and line |46 passes down along cylinder |01 to a point adjacent the lower end. The branches of the other cylinder lines may be connected to and/or passed downwardly along the cylinders of support S' in a similar manner. of course, that any other suitable hydraulic, control arrangement and position of the hydraulicv control lines may be utilized. For instance, the stationary shaft 94 may be hollow, and the hydraulic lines Aextend therethrough, with swivel connections at the outerends for connecting to the chambers in double-ended cylinders |95.

In lieu of the racks and xed gears, the pivotal movement of the movable supports S' maybe effected through a slide and cable arrangement, as illustrated in Figs. 18 and 19. Thus, a slide |50 may be attached at its upper end to piston rodV ||4, a cable |5| having one end |52 attached to the normally upper end of slide |50 and the opposite end |53 attached to the normally lower end of slide |50. A stationary, peripherally grooved drum |54 may be mounted in fixed position on stationary shaft 94, as by a key or by a spline connection with the shaft, as shown. Each drum |54 is grooved to receive two or more complete turns of cable |5|, the central portion of the cable being xed to the drum, as by a clip |55.

However, since the drum |54 is Xed, it cannot turn, and the end |52 of each cable |5| will therefore tend to unwind from the drum |54 while theA endu|53 of thecablewill tend .towind Thus, as in Figs. 14 and 15, the cylinder It will be understood;1

When the piston rod ||4 of Fig.; l0 is moved axially and outwardly from cylinder` |05, the slide |50 will move with the piston rod.-

onto the drum. The result -is that the movable' support S is caused to pivot orvrotate, asV in the vdirection of the arrow offFig.18, thereby-2 moving the pivotal support to a desired position."

. Retraction of piston rod 4 will cause the end |53 of cable |5| to unwind from-the' drum |54,

and the end |52 to rewind thereon, in reversef` direction to the arrow of Fig. 18.

From the foregoing, it will be evident that a` loading device constructed in accordance with this invention fulfills to' a marked degree the requirements and objects hereinbefore set forth. By providing a pivotal or a movable support, and

a bucket mounted thereon which may be moved relatively thereto; the path of movement of the; bucket is notI restricted to an arc defined by thepivotal support, but the bucket may be moved rearwardly Aand laterally, or even rearwardly and downwardly, to crowd or dig into a pile of'- m'aterial to be loaded into the truck. This is a. valuablefeature, since a considerably greater'` amount of material, and a much faster loading rate can be obtained, with a `single positioning.'` of the truck, than if the bucket were restricted.;

to movement only in a single arc. Also, itis:

possible to dig or crowd into material at different elevations, rearwardly of the truck, a fur-` ther distinct advantage in loading material such as sand, gravel or dirt andthe like.

The attachment of the l-oader to the tail gate or the like of a truck, and provision for relatively. quick detachment of the loader, are advantageoussince the truck does not have to carry the weight of the loader around with it at all times.

a iixed frame having an overhanging lip adapted loader. provided with a hydraulic pump for raising the dump bed, provision of a pump on 4the hydraulically Yoperated loading device is advantageous,` since no hydraulic connections need be broken in z v detaching the device from the truck. Of course,

other suitable means for attaching the loader to` the truck, whereby it may be quickly detached,

may be utilized.

The capacity of the loader of either embodiment of this invention to stand upright, when not in use, :and in position to bel quickly attachedl to a tail gate or the like, provides additional-advantage. 1to 9, the hydraulic jacks J are useful not only in maintaining the-device in standing position, but also inA raising `or loweringthe frame-F,- toaccommodate tail gates of different heights, as-

on different trucks or the same truckwhen empty and when loaded. The embodiment of this in-.x

vention illustrated in Figs. 11 to 19, inclusive, if desired, can be rested directly on the bucket', the

brackets |02, and the lower end of piston rodl Or, it may be provided with hydraulic jacks: or the like, as Athe first embodiment. The hy-I draulic cylinder |01 and its piston rod |06, as will be evident from Fig. 14, can be utilizedin maintainingthe device in an upright position. r. The embodiments of this invention are readily` and relatively economically constructed. The.A

embodiment illustrated in Figs. 1 to '10, inclusive, asidev'fromthe-speed reducer, involves primarily plates -which may be readily shaped 'by ame cutting and then welded together, in addition to t the cables and conventionally purchased parts,

such as the pulleys and sheaves, shafts, clutches,

Aw single removable pin, rutilized in conjunction with In the embodiment illustratedin Figs..v

brake bands and speed reducer. The single wrapl drums for the drive cables for the boom and bucket are conveniently made by flame cutting flat plate to form annular plates, and Welding the same to conventional hubs. Aside from the replacement of clutch facings and brake bands, due to Wear. the parts require little attention, and the tolerances necessary in construction are not restrictive.

The embodiment .of this invention illustrated in Figs. 1l to 19, inclusive, which is hydraulically operated, is somewhat lower in height than the cable and pulley operated device, since in the down position, it does not extend proportionately as high as the former, However, the hydraulic device may also be carried with the bucket laid over into or on the dump body.

The hydraulically operated device is relatively easy to construct, since most of the plates may be ame cut and welded together. and the cylinders may all comprise tubing of a suitable size, the piston rods being either solid or hollow rod. The pistons, of course, normally involve rings and some of the parts such as the racks 09 and slides H9, as welles guides H8 and |21, may require special machining, 'but the surfaces to be iinished are not particularly complicated in shape. The hydraulic valve control unit 99 is readily assembled from conventional valves and a housing made of flame cut plate, preferably bolted or otherwise removably secured together, to permit reader access to the interior.

By positioning the controls for the loading ldevice at a point at the rear of the dump body and just to one side of the loading device, the operator has a full and complete view of the operation at all times. Also, the controls are relatively simple, and do not require an undue amount of skill for use. Since both the gear reduction unit of the iirst embodiment and the hydraulic pump of the second embodiment are preferably driven by a power takeoff from the truck engine, ratherv than by a separate vmotor or the like, it is desirable to provide a governor or some sort of automatic accelerating mechanism for the truck engine, so that a heavy load on the bucket, fas when digging into a pile of frozen ore, for instance, Will not tend to overload and thereby stall the' truck engine.

Although two diiierent embodiments of this invention, and certain variations in the construction thereof, have been described in detail, it will be understood that numerous changes may be made. The device need not be fully hydraulic, but may be partly hydraulic and partly other type of mechanism. Also, as indicated previously, other means for attaching thev device to the truck may be utilized, and other types of supports or connections between the bucket and a movable support, as well as between the movable support and frame, may be used. Also, certain features or parts may be omitted, or additional features or parts added, without affecting the basic operating characteristics or the eiectiveness of the device in use. It will additionally be understood that other embodiments may exist, and that various other changes may be made therein, all without departing from the spirit and scope of this invention.

What is claimed is:

l. .A loading .device for dump trucks and the like, comprising a bucket; a frame adapted to be attached in stationary position to a tail gate or the like; a removable pin for securing said frame to said tail gate, said tail gate being provided with means adapted to engage said pin: a sup-i port pivotally mounted on said frame, said bucketv being mounted on said support for relative move..l ment thereto; and means for moving said bucketA from a material loading position to a dumping position above said truck body, including means for moving said support relative to said frameA and means for moving said bucket relative to said Support to vary the path of loading movement of said bucket.

2. A loading device for dump trucks and the like, comprising a bucket; a frame adapted to be attached in stationary position to a tail gate or the like, said frame including an overhanging` lip adapted to engage the top of said tail gate;

a removable pin for securing said frame to said' tail gate, said tail gate being provided with means adapted to engage said pin; a movable support piyotally mounted on said frame; and means for moving said bucket from a material loading posi-L'v tion to a dumping position` above said truck body, including means :for moving said support relative to said frame and means for moving said' bucket relative to said Support to vary the pathof loading movement of said bucket.

3. A loading-device for dump trucks and theA like, comprising a bucket; a frame having a platform and adapted to be attached in stationary position on a tail gate or the like of said dump truck; a support pivotally mounted on said frame; a bucket pivotally mounted on said sup-` port; and means for moving said bucket from -a material loading position to a dumping position above said truck body, including drive meansA mounted on said platform, for moving said support relative to said frame and for moving saidbucket relative to said support to vary the path' of loading movement of said bucket.

4. A loading device for dump trucks and the in stationary position to a tail gate or the like;

drive means including a pair of cable drums and control clutches therefor mounted on said frame; a support pivotally mounted on said frame; a bucket pivotally mounted on said support; and cable and pulley means for moving said bucket from a material loading position to a dumping position above said truck body, including a cable adapted to be wound on one said drum lfor moving said support relative to said frame, and a cable adapted to be wound on the other said drum for moving said bucket relative to said support to vary the path of loading movement of said bucket.

vf1. A loading device for dump trucks and the like, comprising a frame adapted to be attached in stationary position on a tail gate or the likeA of the body of said dump truck; a boom pivotally mounted at its lower end on said frame; a bucket mounted on said boom intermediately thereof; means for moving said boom relative to said frame; a cable for moving said bucket relative to said boom; a sheave pivotal about an axis above the axis of pivotal movement of said bucket; spaced shafts on said boom also above said axis; pulleys for said cable mounted on said shafts, whereby said cable engages the pulleys on said rst shaft when said bucket is disposed rearwardly of an upper center -position and said cable engages the pulleys on said second shaft when said bucket is disposed forwardly of said upper center position; and a swingable support for said pivotal sheave, movable between a rearward position against said first shaft and a forward position against said second shaft in accordance with the position of said bucket.

8. A loading device for dump trucks and the like, comprising a frame adapted to be attached in stationary position on a tail gate or the like of the body of said dump tru-ck; a boom pivotally vmounted at its lower end on said frame; abucket mounted on said boom intermediately thereof; means for moving said boom relative to said frame; a cable for moving said bucket relative to said boom; a drum for said cable mounted on said frame below the pivotal axis of said bucket; a pair of shafts mounted in spaced, parallel relation at the upper end of said boom; a pulley on each saidshaft above said drum, said cable passing over one said pulley when said bucket is disposed rearwardly of said boom and over the other said pulley when said bucket is disposed forwardly of said boom; a first sheave on said bucket through which said cable passes from said pulleys; a pair of arms pivoted at their lower ends below said shafts and extending between said shafts; a pivotal sheave mounted between said arms and through which said cable passes from said rst sheave, said pivotal sheave being adapted to be moved from a position in which said arms abut against one said shaft when said bucket is rearwardly of said boom to a ,position in which said arms abut against the other said shaft, when said bucket is forwardly of said boom,

vas said bucket moves across the longitudinal axis of said boom; a second sheave on said bucket to which said cable passes from said pivotalv 9. A loading device for dump trucks and the like, comprising a frame adapted to be attached in stationary position to a tail gate or the like; a boom including spaced arms pivotally mounted at their lower ends on said frame; a bucket having spaced arms pivotally mounted at their ends on said boom above the pivotal axisthereof; means for moving said bucket relative to said boom; a cable for moving said boom pivotally on said frame; a drum for said cable mounted on said frame adjacent the pivotal axis of said boom; a first shaft extending between said boom arms adjacent the pivotal axis of said bucket; a second shaft, parallel to said first shaft, mounted on said frame and disposed in spaced horizontal relation thereto when said boom is in an upper position; and a set of pulleys on each of said first and second shafts over which said Icable passes alternately, so as to raise and lower said boom when said cable is wound onto and oi said drum. f

10. A loading device for dump trucks and the like, comprising a frame having a platform at its lower end and adapted to be attached in stationary position on a tail gate or the like of said` .-18 dump truck; a boom pivotally mounted on said frame; va bucket pivotally mounted on said boom; a cable and pulley means for moving said boom relative to said frame; a cable and pulley means for moving said bucket relative to said boom; a gear reduction unit mounted on said platform; a connection for said reduction unit, disengageable from a power takeoff on said truck; a shaft driven by said gear reduction unit disposed in parallel relation to said platform; a drum for said bucket cable mounted for rotation on said shaft; a drum for said boom cable mounted for rotation on said shaft; a clutch for rotating each said cable drum from said shaft; a band brake for each said drum; a rst and second control lever extending from said platform to a point at the side of said loading device, said ilrst control lever being operatively connected with said clutches for engaging one saidclutch upon movement a predetermined distance in one direction,

vand engaging the other said clutch upon movement a predetermined distance in the other direction, neither said clutch being engaged when said rst lever is in neutral position; a pair of cam means respectively operatively connecting said lever with one end of each said brake band, so as to release said brake band upon movement of said rst control'lever a lesser predetermined distance in the` direction in which additional movement lof said lever will engage the corresponding clutch,-and to maintain the position of said brake band wheny the opposite brake band is released and the opposite clutch engaged; and means operatively connecting the second said 1ever with the opposite end of the brake band for said boom drum, whereby said boom brake may be released while said bucket drum brake isvreleased or the bucket drum clutch is engaged.

11. A loading device for dump trucks and the like, comprising a frame adapted to be attached in stationary position on a tail gate or the like of said dump truck; a support mounted at its upper end on said frame, for pivotal movement about a horizontal axis, said support including a pair of spaced, longitudinally extending hydraulic cylinders, a piston rod extending from the upper end of each cylinder, and a rack slidable longitudinally with respect to each said cylinder and attached to each said piston rod; av gear in engagement with each said rack and mounted in fixed position on said frame, at the pivotal axis of said support, whereby longitudinal movement of said racks produces pivotal movement of said support; a bucket mountedfor relative movement on said support; and means for, moving said bucket relative to said support;

12. A loading device for dump trucks and the like, comprising a frame adapted to be attached in stationary position on a tail gate or the like of said dump truck; a support mounted at its upper end on said frame, forpivotal movement about a horizontal axis, said support including a pair of spaced, longitudinally extending hydraulic cylinders, a piston rod extending from the upper end of each cylinder, and a slide movable longitudinally with respect to each said .cylinder and attached to each said piston rod; a pair of cable drums, each mounted in fixed polends lof one saidslide and having an intermediate portion extending a plurality of times around ythe ycorresponding drum, whereby longitudinal Amovement ofl said slides produces vpivotal movey1aMisato "mentz'of-*saidsupport; a bucket mounted-for vrela-tive movement on saidy support-,fand means Vfor moving saidr` bucketrelativeto-Vv said support.

' 113` A loading device for dump'tru'cks andthe like, comprising av frameadaptedl to be attached in stationary positionon a tail; gate or'the-like ofsaid' dump truck; 'a' movable support mounted at its upper end on said' fra-mefor pivotalE movement about a'horizontal'axis,'saidlsupport in- Ycl'uding a pair of spacedi, parallelhydraulio cyl-- inders each having an upper andlower chamber,

`-and a piston rodr extending fromi'each said cham'- said truck; Ia stationary, hori'zontalsha-ftl mount- 'ed-adjacent the-upper'endof said'fframe; asupport" mounted at its upper end4r Vfor pivotal move- Qment about said: shaft; meansl-mov'ablealongitudinally with respectto-said support fa bucket pivotally mounted'on'the lower end of saidfmova'- I ble means; a hydraulicL cylinder pivotally mountedat its upper end on said shaft, theupper-en'd of'rsaidA cylinder being oifset'fronrsaidfshaft toward said tailgate; and a piston rodextending from' the lower endf of said' cylinder and pivotally connected to saidfbucket, for producingYV pivotal movement of said'. bucket-'relative to 'saidmovable means.

` l5'. A loading' device for dumpitrucksand the i like, comprising a frameadapted to'fb'eV attached in stationary position to ay tail gate or Vthe like,

said frame including-a'pair' of'fside plates-each having an overhanginglipadapted tofv engage the top of saidtail gate, said'sidel'plates being spaced' further apartA adjacent r `the* lower :ends

thanV adj acont'A the? upper ends thereon-and said frame'including a platform extending-between the lower ends of said side' plates; 'a`V removable pin.' for" securing said frame-to" said' tailr'gate,

said tail gate being'providedwith` means adapted i v to engageI said pin drivemea-ns including a pair of" cablefdruins and" clutch-esC therefor mounted lon said platform; a slowspeed driveshait for selectively rotating' said cabledrums' through said; clutches' and'extending through said frame side plates; a boom' including'spa'ce'd' arms pivotallymounted" atY their lower-"ends" orr saiddrive shaft' outside' of said frameisidef plates;v an" intermediate shaft extending between" said boom side plates, adjacent the 'upperendv of; said frame with said boom in an'upper 'pivotali'positiom `-a second intermediate shaft, -parallel34 to said" rst intermediate shaft; mounted onsaid frame'at the upper end' thereof, aboversaidf, overhanging lips; a pair of' upper' shafts extending in' spaced,

said upper shaft, said' cable passing over 'one saidpulley when'4 said1 bucket is disposed rearwardly oi" said boom" and over the other said Apulleywhen said bucket is disposedy forwardly of said' boom; a first sheaveon said bucket through which said cable passes from said pulleys; a

pair of arms pivoted atltheirlowerends onl said 'nrst' intermediate shaft and extending' between sai'dupper shafts, each saidarm havinga'rear- 20 wai-idly extending nose ra pivotal sheave' mounted?l between i said noses' and through which' said cable passes from said.V first. sheave,- said pivotal sheave beingI adapted to be moved from a position in .which said arms abut against one said' upper shaft when-f said bucket is rearward-ly of said boom to a position in which said arms abut 'against' the other 'said upper shaft, when said bucket is forwardly :of said boom, as said bucket moves across the longitudinal axis of said boom; efsecondf sheave on' said bucketto which said lea-ble"passes from saidv pivotal sheave; a flanged -guidefforf said cable on each said upper shaft aridoverwhich said-cablepasses from said second I 5 "guide whensaidfbucket is disposed rearwardly of bucket', sheave,l said cable passing over one said said boomand over the other said guide when said 'bucket'is-disposed forwardly of said boom, the en'dof-said cable being 'fixed to said rst intermediate sha-ft; a cable for saidboom, adapted to be wound on the other of said drums,l the opposite: end" off said" cable being fixed to said frame; anda'series of Vpulleys on each said' intermediate "sha-ft', sa-i'd cable passing over first and second intermediate f shaft pulleys` alternately.

lo, AA loading devicefor dump trucks andthe like, compris-inge frameradapted to be attached in stationary position to a tail gate or the like, said frame including a pair of side plates each having an overhanging lip'adapted to engage the top ofsa'id-'tail gate, saidframe having a mountin'gfplate extending between the lower ends of said' sideplates' and to one side of one said side plate; an' hydraulic pump mounted on said mountingplate; hydraulic control means mounted' orf-said mountingI plate on the side extending portion) thereof; al stationary, horizontal shaft mounted adjacentthe upper end of said frame; support including two sets of side plates mounted'at/ their upper ends for pivotal movementaboutsaid shaft; a pair of' spaced parallel hydraulic'cylinders each disposed between a pair of side plates' and each having an upper and lower Chamber, anda piston rod extending from each saidchamber; aslidable guide attached toeach said lower piston rod and extending upwardly alongsidey the corresponding cylinder; a guide plate for' each said guide; an adjustable roller adjacent the lower end of each cylinder for engaging said guide; a bucket pivotally mounted on the lower" endsr of said lower piston rods; a hydraulic cylinder pivotally mounted at its upper endk on said' shaft, the upper' end of said cylinder being, offset-from saidshaft toward said tail gate; arpiston' rod'extending from the lower end of said'cylin-der' and pivotally connected to said bucket, for' producing pivotal movement of' said bucketrela-tiveto said lower piston rods; a rack slidable longitudinally with respect to each said cylinder -and attached to each said upper piston rod; and a-gear in engagement with each said rack and mounted in iixed position on said shaft, whereby longitudinal movement yof said racks 'produces pivotal movement of said support.

ciuding 'means forA moving said" support relative to said frame and cable and pulley means for independently moving said bucket relative to said support to vary the path of loading movement of said bucket, said cable and pulley means including a rotatable sheave pivotal about an axis transverse to the axis of rotation of said sheave, said pivotal axis being parallel to but above the aixs of pivotal movement of said bucket.

18. A loading device for dump trucks and the like, as dened in claim 17, including means supporting said sheave for restricted movement of the pivotal axis thereof between positions to front and rear of the normal vertical center line of movement of said bucket.

19. A loading device for dump trucks and the like, as defined in claim 2, wherein said movable support is pivotally mounted at its upper end 22 on said frame; said bucket moving means includes slide means movable longitudinally of said support; and said bucket is pivotally mounted at the lower end of said slide means.

' RAYMOND L, PHERSON.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,857,302 Hawkins May 10, 1932 2,004,022 Twik June 4, 1935 2,119,139 Owen et al May 31, 1938 2,321,630v Shippee June 15, 1943 2,344,796 White Mar. 21, 1944 2,441,591 Owen May 18, 1948 2,480,959 Presnell Sept. 6, 1949 

